- L joint
- L wave
- L-tectonite
- LA-ICPMS
- labbe
- Labrador Current
- Labradorite
- Laccolith
- lacunaris
- lacunosus
- lacustrine
- lacustrine sediments
- lacustrine soil
- Ladinian
- Lafond's Tables
- lag deposit
- lag fault
- lag gravel
- lagoon
- Lagrangian current measurement
- Lahar
- lake
- lake breeze
- lake effect
- lake effect storm
- lake peat
- lake plain
- lamb-blasts
- lamb-showers
- lamb-storm
- lambing storm
- Lamellar
- lamina
- Laminar Flow
- laminite
- Lanarkian
- Lanarkite
- Lancastrian
- land
- land and sea breeze
- land breeze
- land bridge
- land hemisphere
- land ice
- land pebble
- land pebble phosphate
- land rock
- land sky
- landblink
- Landenian
- landfast ice
- landform
- landform map
- landlocked
- landscape
- Landslide
- landslide track
- landslip
- Langevin ion
- Langmuir circulation
- lansan
- Lanthanite
- lapies
- Lapilli
- lapilli-tuff
- Lapis Lazuli
- Lapis Ollaris
- lapse line
- lapse rate
- Laramic orogeny
- Laramide orogeny
- Laramide revolution
- Laramidian orogeny
- lard ice
- lardite
- large ion
- large nuclei
- large scale
- large-scale convection
- laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS)
- latent instability
- lateral accretion
- lateral cone
- lateral erosion
- lateral fault
- Lateral Moraine
- lateral planation
- lateral secretion
- laterite
- lateritic soil
- laterization
- latitude
- latitude effect
- latitude variation
- latosol
- lattice drainage pattern
- lattice-preferred orientation (LPO)
- Lattorfian
- Laumontite
- lauoho o pele
- Laurasia
- Laurentian Plateau
- Laurentian Shield
- Laurentide ice sheet
- Laurite
- Lava
- lava blisters
- lava cone
- lava dome
- lava field
- lava flow
- lava fountain
- lava lake
- lava plateau
- Lava Tube
- law of storms
- law of superposition
- layer
- layer depth
- layer depth effect
- layer of no motion
- layered complex
- Lazulite
- Lazurite
- LCL
- leachate
- Leaching
- lead
- Lead Sulphide
- leader
- leader stroke
- Leadhillite
- leaf mold
- leakage halo
- leaking mode
- leaky wave
- Lease Bonus
- ledge
- Ledian
- lee dune
- lee tide
- lee trough
- leeward tidal current
- leeward tide
- left bank
- left lateral fault
- Left-Lateral Fault
- left-over grain
- leg
- length of record
- lens
- lenticle
- Lenticular
- lenticular cloud
- lenticularis
- lentil
- Leonardian
- lepidoblastic fabric
- Lepidolite
- Lepidomelane
- leptogeosyncline
- Leptynite
- lesser ebb
- lesser flood
- leste
- Leucite
- Leucophane
- Leucophanite
- Leucopyrite
- Leucoxene
- levante
- levantera
- Levantine Basin
- leveche
- Levee
- level fold
- level of free convection
- level of nondivergence
- level of saturation
- level surface
- Levyne
- LFC
- Lherzolite
- Liassic
- Libby effect
- libeccio
- Libethenite
- lichenometry
- Liesegang banding
- Liesegang rings
- lift
- lifting condensation level
- light climate
- light freeze
- light frost
- light ion
- light pillar
- light-of-the-night-sky
- lightning
- lightning channel
- lightning discharge
- lightning flash
- lightning stroke
- Lignite
- lignite A
- lignite B
- lily-pad ice
- Limb
- Lime
- lime-pan playa
- Limestone
- limestone pebble conglomerate
- limit of the atmosphere
- Limonite
- Linarite
- line blow
- line defect
- line gale
- line of strike
- line squall
- line storm
- Lineament
- linear
- linear cleavage
- linear shape fabric
- lineation
- lineation track
- linguloid ripple mark
- linguoid current ripple
- linguoid ripple mark
- Linke scale
- Lipalian
- lipper
- liptinite
- Liquefied Natural Gas (LNG)
- liquid limit
- liquid-dominated hydrothermal reservoir
- liquid-filled porosity
- liquid-water content
- Liroconite
- lit-par-lit
- lithic tuff
- lithifaction
- Lithification
- Lithiophilite
- litho stone
- lithoclase
- lithofacies
- lithofacies map
- lithogeochemical survey
- Lithographic Limestone
- lithographic stone
- lithographic texture
- lithologic map
- lithologic unit
- Lithology
- Lithomarge
- lithometeor
- lithomorphic
- lithophile
- lithophysa
- Lithophyse
- lithosiderite
- lithosol
- Lithosphere
- Lithospheric Plate
- lithostatic pressure
- lithostratic unit
- lithostratigraphic unit
- lithostratigraphy
- lithotope
- lithotype
- little brother
- Little Ice Age
- littoral current
- littoral drift
- littoral sediments
- littoral transport
- Lizard Stone
- Llandellian
- Llandoverian
- Llanvirnian
- llebetjado
- Load
- load cast
- load metamorphism
- loam
- loaming
- lobate rill mark
- lobe
- local angular momentum
- local attraction
- local base level
- local change
- local extra observation
- local forecast
- local inflow
- local magnetic disturbance
- local peat
- local relief
- local storm
- local winds
- Lode
- lodos
- lodranite
- Loellingite
- loess
- loess kindchen
- logarithmic velocity profile
- lolly ice
- lombarde
- Lomonosov ridge
- long wave
- long-period tide
- long-range forecast
- longitude
- Longitudinal Dune
- longitudinal fault
- Longitudinal Profile
- longitudinal stream
- longshore bar
- Longshore Current
- Longshore Drift
- longshore trough
- loo
- loom
- loop bedding
- loop lake
- loop rating
- lopolith
- losing stream
- lost stream
- Love wave
- low
- low aloft
- low clouds
- low Index
- low tide
- low water
- low-angle fault
- low-angle thrust
- low-energy environment
- low-moor bog
- low-moor peat
- low-rank metamorphism
- low-tide terrace
- low-velocity layer
- Low-Velocity Zone
- low-volatile coal
- low-water inequality
- low-water interval
- low-water lunitidal interval
- low-water neaps
- low-water springs
- lower atmosphere
- Lower Cambrian
- Lower Cretaceous
- Lower Devonian
- lower high water
- Lower Jurassic
- lower low water
- lower mantle
- Lower Mississippian
- Lower Ordovician
- Lower Pennsylvanian
- Lower Permian
- lower plate
- Lower Silurian
- Lower Triassic
- Lowland
- LPO
- LS-tectonite
- Lucullite
- Ludian
- Ludlamite
- Ludlovian
- Ludwigite
- luganot
- Luisian
- lum
- Lumachel
- luminous cloud
- luminous meteor
- lunar atmospheric tide
- lunar inequality
- lunar tide
- lunate bar
- lunette
- lunisolar tides
- lunitidal interval
- Lusitanian
- Luster
- luster mottlings
- lutaceous
- lutecite
- lutite
- Luxullianite
- Lydian Stone
- lysocline
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